Aiming at the thermal effect on the vertical piled and cast-in-situ deck wharf,comparing inner force results due to the different length(75,150,200,300 m)of structure segment with additional thermal action based on 3D dimension calculation by international finite element software,the results reveal that the internal forces such as bending moment,shear force,axial force of pile foundation and deck elements can be significant reduced by the appropriate growth of segment length plus the effect of thermal actions.